JPS6223524Y2 - - Google Patents

Description

[Detailed description of the invention] The inventor of the present invention made use of the fact that a solid placed in a horizontally rotating shear flow moves centripetally.
A method for continuously separating solids contained in a liquid was invented (Japanese Unexamined Patent Publication No. 54-61363), and the present invention is an improved version of that method.

The separation tank according to the present invention continuously separates a large amount of raw water into solid and liquid in a flowing state.
This is a completely new system that differs in principle from the conventional sedimentation tank system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes an aquarium, and a circular aquarium as shown in FIG. 1A or a rectangular aquarium as shown in FIG. 1B are shown as examples. As shown in Figures 1A and B and Figure 2, the raw water is fed into the water tank 1 so as to generate a horizontally rotating shear flow in which the flow in the upper part of the tank 1 is slower in the center and faster in the periphery. in the upper half of the water tank 1 close to the water surface 4 (in practice, the center position of the raw water inflow pipe 5 should be set at the water depth H of the water tank 1).
The raw water is allowed to flow in from the periphery of the water tank in the circumferential direction via inlet pipes 5, 5, 5 (3/4 to 1/2).
That is, the inflow pipes 5, 5 are provided tangentially around the water tank. Thus, a water intake pipe 8 with an open top end is erected at the center of the water tank 1, a water intake board 9 is provided at the upper end of the water intake pipe 8, and a float 11 floating on the water surface 4 is placed on the water intake board 9 via a connecting body 14. A system will be installed to take in water. In the figure, 15 is a horizontal part (parallel to the water surface) around the water intake board 9. The connecting body 14
As shown in the figure, it is made up of a screw rod 12 and a bolt 13, and can expand and contract depending on the position where the vertical opening size of the water intake port 6 can be adjusted. At the bottom of the tank, there is a funnel-shaped outlet 7 for water containing solids in the center.
will be established. Therefore, in order to achieve the best effect, it is necessary to adjust the size and specific gravity of the solid content contained in the liquid.
The size of the tank, the flow rate of the rotating flow, the inflow angle, the depth of the tank, and the angle of inclination of the bottom of the tank shall be determined according to the viscosity of the liquid.

FIG. 3 shows the above-mentioned water tanks combined in multiple stages and connected with piping. The water from the water intake port 6 and solid matter-containing water discharge port 7 of the first-stage solid-liquid separation tank 1 is
The raw water was connected to the inlets 5' and 5'' of the second-stage (two) solid-liquid separation tanks 2 and 3, respectively, in a multi-stage manner so as to flow directly or through the solid-liquid separation tank 10. The four types of water from these second-stage solid-liquid separation tanks 2 and 3 reach the third-stage (four) solid-liquid separation tanks (not shown), respectively. As a result, even better separation of solids and water can be obtained.

As mentioned above, in the present invention, the water intake port is plate-shaped, and the water depth h at the opening position of the raw water inflow pipe 5 to the water tank 1 is defined as h = (3/4 to 1/2 2
)H, it is possible to accurately prevent sediment such as sand from being stirred up in the water tank 1, and to prevent solid particles such as sand from floating near the water surface 4, thereby preventing solid matter and water. This is an economical and truly rational device that efficiently performs the separation. The present invention is also excellent as an extremely compact sand removal device that can be used as a replacement for conventional settling basins in hydroelectric power plants. When the water depth h at the center position of the raw water inflow pipe 5 is made less than 1/2H, there is a risk that sediment such as sand collected in the lower half of the water tank 1 will be rolled up, which will have a negative effect on solid-liquid separation. effect. In addition, when the water depth h is made larger than 3/4H, it is not preferable because there is a risk that the raw water will directly mix into the water taken near the water surface 4 of the water tank 1, and particles (solids) such as sand may be mixed in. It is. Therefore, in practice, h=(3/4 to 1/2)H.

As mentioned above, the water depth h at the center position of the raw water inflow pipe 5 is set to be h=(3/4 to 1/2)H with respect to the water depth H of the water tank. In the case shown in Fig. 2, h≒3/5H.

[Brief explanation of the drawing]

The drawings show an embodiment of the solid-liquid separation tank according to the present invention, and FIG. 1A and FIG. 1B are plan views showing the embodiments of a circular water tank and a square water tank, respectively, and FIG. Fig. 1A is a cross-sectional side view, and Fig. 3 is a flow sheet in which water tanks are combined in a multi-stage manner and connected with piping. 1 is a water tank, 2 and 3 are second stage water tanks, 4 is a water surface, 5 is a raw water inflow pipe, 6 is a water intake port, 7 is an outlet for solids-containing water, 8 is a water intake pipe, 9 is a water intake board, 10 is a solid separation tank, 11 is a float, 12 is a screw rod, 1
3 is a bolt, 14 is a connecting body.

Claims (1)

[Claim for Utility Model Registration] In the upper part of the tank 1, a horizontally rotating shear flow is generated, in which the flow is slow in the center and fast in the periphery, and horizontally rotating in the lower part of the tank. In order to weaken the shedding flow, raw water inflow pipes 5, 5 for raw water to flow in are provided tangentially around the water tank, and a water intake pipe 8 with an opening at the top is erected at the center of the water tank 1, and the upper end of the water intake pipe 8 is To, water surface 4
In a solid-liquid separation tank device in which water is taken in by providing a water intake means suspended on a float 11 floating on the ground, the water intake means is a water intake means having a water intake port 6 on a disk-shaped water intake plate 9, and , A solid-liquid separation tank device characterized in that the water depth h at the center position of the raw water inflow pipe 5 is h=(3/4 to 1/2)H with respect to the water depth H of the water tank 1.